Underpin vs. Underscore — What's the Difference?

Support (a building or other structure) from below by laying a solid foundation below ground level or by substituting stronger for weaker materials.

An underscore, also called an underline, low line or low dash, is a line drawn under a segment of text. In proofreading, underscoring is a convention that says "set this text in italic type", traditionally used on manuscript or typescript as an instruction to the printer.

Support, justify, or form the basis for

To underline

To support from below, as with props, girders, or masonry.

To put emphasis on; stress

To give support or substance to

To cause to appear important or deserving of attention

(transitive) To support from below with props or masonry.

A line drawn under writing or text to indicate emphasis or italic type.

To give support to; to corroborate.

An underline; a line drawn or printed beneath text; the character _.

To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.

(music) A piece of background music.

To support by some solid foundation; to place something underneath for support.

To underline; to mark a line beneath text.

Support from beneath

To emphasize or draw attention to.

Support with evidence or authority or make more certain or confirm;

To draw a mark or line under; to underline.

A line drawn underneath (especially under written matter)

Give extra weight to (a communication);

Draw a line or lines underneath to call attention to